Using certain inventory items on hotspots...

[BerserkerTails]

Another n00bish question from the most annoying n00b on the planet!  

This is best described with an example...

Roger finds himself inside a blank room. On the floor is a triangle shape and a square shape, which he picks up. Now there's a door to get out of the room, but it's locked. Beside the door is a triangle-shaped hole. By using the triangle shape on the hole, the door is unlocked.

How do I make it so only using the triangle, and not the square, will open the door?

In other words, how to I make a puzzle solvable by using a specific inventory item on a specific place?

Thanks in advance!

[Gilbert]

Do this:

For the hotspot, add interaction for "Use inventory on hotspot", for the action choose "Conditional - if inventory item was used", then set the inventory item number to match the desired item.

After that, right-click on the "Conditional - if inventory item was used" action and choose "Add child action..." then do whatever you want there.